Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b310e5a2ee34fb62bd37e62b29037c85dcc0701fd12cacc2a1b1034ba36bf56b' 
  AND token = 'Bj5BggTL3Vd3TvuJqecwm5gKlVg6qGfs+LxSB+2/cws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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