Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8974d725b314d98b3dcfe9c5645d45b4d671f986e7ce57ee0e83341ea85e43' 
  AND token = 'jwcrQXU6Ad7bmpMAMZ8OivFwJ0gySXVULoPNZni9Vj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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