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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '03b40595324559a48f91a5cb33f47f43bf68e70865ca2c206ad3c004fe881a75' 
  AND token = 'JlFuWiuGu3gScVRuOoquq+4F8uoqLPSQROdIJ8i49HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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