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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c861d5694a1a805004d79ea7a3614b5c6e7bca132b696a7d7c3ce73b658e7c61' 
  AND token = '6ddwYXEjj7+jy9aqlmGp35A08zNKBnio3xmTDX8nMfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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