Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d14b59f19c268bc85852e690709d5d0c407e67ca521f28a0a97e8187496770f' 
  AND token = 'nsAzJJGdjLyziCJfvIl955yefmsiy+k2fjqXOYQVycs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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