Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5171c94bb35ff3b91fd4a3d248bd0c1b1cd95090d7cbb74a0722b873bc37ba7f' 
  AND token = 'UAJOX9YmUgLiovw64PMR1WWFBQmcbtjYVgFFzSTffSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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