SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fc76eb5036afa2503398a49548fbdeb77e1949446a520361591b15e6e1d21c89' 
  AND token = 'Co/xpj9NcMr+K1wNq0XSik+Q3L8csImTXhGRm32y6Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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