Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa7dab2b137d95ca6c402cf3c343d712f2e38f28845dc5a030717b5c60b9aa85' 
  AND token = 'a3+HlUE4GCbpBtBS2FoYzXUdPvBaEABE7pTKwvqB5Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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