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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb02a54a68f1714b07e6c7bdbb473034de73bad9a5fa0580ff16ccbfebf6222f' 
  AND token = 'kHm9foHdnO9D5Nd26gztqrAvioM2yvPF8wXvMkz2ih4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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