Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1dc90372e445852425552490e13af9d944e87128c507eee9fe617b1e956a47' 
  AND token = '6u0y60VVB2ipDncLy7mYL0x7q294bEbKFZgDWIQh7X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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