Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d6811752886c15e7779368385c47ce5bfe35886e242d4084bccc549ed32191' 
  AND token = 'Mfztjm2eWjauq76+Rx7rqYaImvRc1ya3byZ4Z1M8XDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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