Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676204c0651f5daa35daf6300ee1f392e2fe57b0f365520526f0d7db41f17b42' 
  AND token = 'uIjXikuI4qhCkcUCGngDiqEep+9nfyCJHReDcdqx9w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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