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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '576784cbf8650c144ff929946b4a1be899d63837d2a7a9f5dc6325ba7a8dacc1' 
  AND token = 'Dm39NhvM709O5yn0vs/jHJ7nZzuCjvx4n9AkU3iyDlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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