Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d8649e4ccc09872ecdb23ae4994a8fb5a645a68d23ec992c6d9ddebfcfe68a' 
  AND token = 'Lal8gDfBhMLxh4+DI+/blc3eHnTmKgnxoF3NmFLdT3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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