Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f015bf8890a26545ea45b39274dc0b6d9a337c7c89d1d8d05f18da8b5235b660' 
  AND token = '2lWT5GsEy/Ke3cqRja/uw59As6WEO0JBpszJvjd9k14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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