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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b7ee237189e1df0219329a4e0d1fb31eae18ad3d617a2fbdbab5a74adea52523' 
  AND token = 'UzXg581ogQtrecsW5B1FMA50JTlV3ff77Q+xPUeaBCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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