Sandbox

SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b31b9e2c90fd22b228d4b47390a2d0cc7bea3b2557e6c4d66fd48c97b546b124' 
  AND token = 'U+XNPbBCeVTFFMdGjpEeurdtaR5lu8fFa3Xr1Eu7QZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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