SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'aa8dc7e3c658ffe3eead7b6c615e320708f0b6979b01d150c9ab985d2f37ccdd' 
  AND token = 'yDt4WGhL+OL4Jsl0X4Ag7zQxHeKiUB86p6vRtnYLsXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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