Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803e71cccb9e962765f841e0b76070c7a1403f2bb2c2ec0051668e68f4342cbe' 
  AND token = 'yIpccJkGVIyHNPex9XAS3JctKLR5MM1ndF99wheeG0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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