Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd765351f463088fc574216dec41d8640f8aeed74a82a1b1dce8a297858e3947a' 
  AND token = 'GyWrxQ/jfNHquM8H8NCGhc1T9oexSivC5ZOkO9fF5EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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