Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2843f0bf60d98c36e8f7fc4512d6c043d08750fd8e7f4d8fe68b15f38c20d8cf' 
  AND token = 'XLZhs4njcCbXEX2RGQ3efE7DJDMYjI8x5/LDZUukZUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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