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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '41bf8e6ff8f1ffb8bfd9a469ce6258b3cbcf1a636ea946fdd6a91932f0f7c7f7' 
  AND token = '4hzskA3JKXNfCOpwquPDbEZEWHe7VItIfnUN4OHcoyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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