Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f31a544cac8fbe5b28026935fc7a5cff6d01018d502fb2c9152b564632f9b673' 
  AND token = 'lxAJ1aSDP7RKlpYOG0++mKGT966rK4DJbmdMFP5pbic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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