Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da1392c93efbd97ec982b532b4b3b2143f86f80f0253a8a25e93e4bc4ed3e40' 
  AND token = 'bgNXtzZaU8U0+IUVCfhqiXKJ6WGLUKSIeF46N3L4Tr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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