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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '65b51bdc1acc5e952fd6965921ffde445e9d874b2cb3891c8dc077557c5a4637' 
  AND token = 'lthiDAa4v/noY/ZxsL/Spb0cV0bcydRTAnHZYM+Ntnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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