Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cff2924e2f87f68e21e0e456082b2f9928b83f21c9366b9d8d2c34c539b75ee' 
  AND token = 'BlzNdcVQYu3Sv+4jtI+AvnAig0y2cFZ7Uy+Q+JzfSjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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