Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a37b70fcb311c44f855b4814b1fd3dc1ab8e6b504fdff51ba740b10ba0819c9' 
  AND token = 'yXAS0nYsLrXdqH7GCyPi/4mtYcxQQg9nYPSANZqZiM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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