Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e51e55d79f54cde358101021273108cf9d8783f4cd076ea3a0aa9636909914e' 
  AND token = 'vd+5f0EcRQx0zkHLreQYTD98Q4Xb7HYlwGxjFNK4fdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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