Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbda5fc8647494cf9b50eb2934194ff8a800a34e483edc27b5a0a2a8841ae136' 
  AND token = 'CG0N6sDQq0Ce72Z+gwUM3vMZPV7VF6uUPcrMUFWIVqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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