Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84cc5d4d2086f2c1948f28d04c265de6e37714a58c8361705f95a03c8b3fa590' 
  AND token = '/xUgKlO406lmS41hNtzeMLWUe1G4RsVaY2854rrTqcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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