SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6ba5d30ed7ebdd27ce8a8e8d44083490ebb21881446fbfd46333dc644b739c80' 
  AND token = 'thYLvTfR4HqzwArh9ru9j3ivtw1LQ5YkQnyRTBFSKls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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