Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c0631643e48448e6ed040df1c249d975cdc64cc833a494b5b0460c19b6df1f' 
  AND token = '/pUwybHsyIg9B7ahgrSXpLCbEu1Vx4PFiwvDQIFncQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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