Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ddb18e1c153f8a0bfeb739139d0ee4a4ada2aa4fb5f05bff60c1ce2e6c7d5f' 
  AND token = '/us8gzXaNRHut572mnUXO4uF+sWRcuwkNDKJ/I97+VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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