Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed558b17536ab1051e900bcea435db732444afed5aaf5684234d4c09ac8a48af' 
  AND token = 'k4vkpEnNMmyRY5kil9AnN2HR+tqxdLMP0ciUYpDOIzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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