Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75f9e5906e031cb294291e9bf1cdfef3593a07137bf5df9c17e9014d4a51d5d' 
  AND token = 'S1Y9aIkkXBj4QpXRnxYKHUF+royzLArwtDrc2lgDS9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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