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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8ca0bf4fe68581647aee5e8de8fc39c984f5cab93e7642e7e361b09e485dced2' 
  AND token = '3KjWudv2ne3Ql974XMTqhBgKZgIsXB73AKdrHFn3vfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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