Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83a6c363793d5b2a57eceb419f7e9563954a80b26425e041c7654931d750259' 
  AND token = 'WiQ+CmHZCNkwnyQCItj7WY3crwOrY5QijrA8NlpjKLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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