Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c92a7643113a39988533aad7b6579a8694be06d36e351eda7b13b982458ab3' 
  AND token = '4/wq3a4sHZbfsj0dv5UtNcJNNI2hbMW/quhVOk7jU+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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