Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81529df496ac3f67dee325cc6f1ed8ccef0c28d0b29eed5a98d09a141addf018' 
  AND token = '/qiMpWjDHEH+V699xcr7eGsQsnjsbomFEK5qZemxbjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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