Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6f6f2cba3f69f446d84cd71598a5dec024606efbee611de97f401763988c38' 
  AND token = 'qifeov6mpPQucMQP1t0lxgla+onrklThoPF6oDYPJLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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