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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '624a11bf257bd2e090ac7f17a7c935fb4565689c9d885e50d8286ce0d79e6a91' 
  AND token = 'kkni/9UXOlm8l+r9trWuATgs3XRikmm+sVaymQqEnNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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