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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2866074bf49861e64c5ad1d449cbd40d8bb63f75e2303753d432f50a75089ff9' 
  AND token = 'pMmhI0VNq7ZoDa0ve92ijq00vl4bWSL91RwjSf2ZU0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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