Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69e7be4e62b6252a1f1b271284f21cdfa1536e8ea94c016d0c0d77ba027ce82' 
  AND token = '71hUVZ6agrwHYOzfExLJtgMBfmXs1rbmLv5WPgV6nK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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