Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca0a9bc8c7a8345f04df4dcb69535851a918ddad55306abba9c9a0af2e7d9bc' 
  AND token = '3XwlPlaH+h41WdSwOjDOhjtXz5i2rvlFr5AVBZAebU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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