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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '664ebe6fcb959929781333dc76ab8f6c918d332b6a51a3e1695b30f8c532623d' 
  AND token = 'OYMTaG2RZCC1fryI7OEbscOteMFFXQufuqe6yOyu9Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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