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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '51f5677882664e782cf0ecdab1b17a52627c389b6407ff0804aff104fc0d9ec0' 
  AND token = 'MdWA7FyClrOLep6RIFI1r4rq/8UmWrAr/vM0+0CfY+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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