Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cd8520eeee86dabc177cc7da526f38f874eaf94385bd6a2967886a7dbe5469' 
  AND token = 'loR46lC1nttqa4XW+pMAHoKkE/SRKxkcxEJMzXKpaNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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