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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b6504476f75c72bf4cba6964683a8e2337d6c6bdc94afda7f61910383119e6d3' 
  AND token = '7dYwhpvvb08L1E7pLFcrT83+66E5yjbuM7ykGg+/c/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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