Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c75c6ece67ff4e5f1ee527d15be1fc8788991c4bb92aa05bf7f89fb58ced56' 
  AND token = 'ldtDIYq9AVg7TbCgsFjBRur4NzgdWqtnGnstdAsHp/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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