Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7397ad1344dd21764e1cfe3001694c600a1902327ef783b34acbfb06fe9478d1' 
  AND token = 'Ra3iLKrPTlRqN1Zojuky6bJ/6a6OVB8Hlop4E3XJwsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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