Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8feff1d234c726ab3afca9c0ad1e58c06adb8dfcb2cd29faa7c6793caee5857f' 
  AND token = '5TN68srFB/mBe0E5g11CBaNojpvocDcKQGxJumg1Fo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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