Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2600637aff30857f62bbf9a1704272d5cd862dd368c6c47b30d2d4fbe00da70' 
  AND token = 'rb9ZTwkoSdZMHxVunApYQfGhpRAJ+P6IEvubFVD+beM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}