Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94ba67f1b1e3ceea20eef275fba56ddc1e0cb37f6be9060e306778ec21da8ca' 
  AND token = 'of+DMcg0WJ9U2tKdPAxpJWVUS6tNavjWXm9S/Bm7nts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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