Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '721886460353e9a0e02b355765fd83c48ce908518491dc8dbd5d2cdd5403ce28' 
  AND token = '3gV593LDkVgMezgYogNGpnEVJIZXC+1s5a0nOE/qpEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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