Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5767eef53f1901d444964b9363dda7c3da8e3e6ce3cf0650cb8d6351a2864d85' 
  AND token = 'OD9QbNUSIxNz+ZKXI2VtsR4V4iTDwfxnW4XoFUdXhVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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