Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8d053a96a4f383e0cd903a9f5d27ca474d102e85a27808a7c237df3dccc524' 
  AND token = 'Pp72uCXDQKKCLCmstGmtwgOsljxuyp0zflk3hjJqk/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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