Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a9a27832923dc6a13cbdce65ffe80af307dda0767c9b845c276e3555c7eced' 
  AND token = 'lRXqlpPrd6+rQ1qAPih8PiMn/jWMWpJnCmlP0+578xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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