Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '75d990fa9e486bad5663783f1a37e873d219cc23af55929e438fa33ecae1ddc3' 
  AND token = 'k3ih13ONQ/BOjVdjGRTZMsFw7x2XeJ8Ro3w9RYd612c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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