Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d8f1ff168ffc07bd4a6a7cbd6f010d4d3b2c70b783b1c9b6e8d474f8870785' 
  AND token = 'Fq4wS/fsQm0X2X+jXdbRWmEKhpQLnWHwcRQ1f7DFBz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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