SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '27fe7ba697eafd5100dc03f29e59e085e2c373dde9779d6826831b5bdf74cf73' 
  AND token = 'AQzxsejLcD2IOJesnv+KZrmwXHsng0vJCgNkXL7FXMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00401

JSON explain

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