Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39c6706b05b547918da85c1004d394fbe32d4d041d0a65121024e37b8c5a0a3' 
  AND token = 'mXbCJoBtKEb2EWRJoqsY67BdTYdvMsriwO4A5GLF29o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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