Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61514d2ca6922d4bf0f962f71a19210aebc0616e49ff4d9de12b09eda5d573d3' 
  AND token = '04tFUUW+Js0j4tkwwKfdYif9s9jHX4InL0Z1CSzK1xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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