SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '43c933beb94079ba0cd17a4ebd308114972418e8c0abe2f834b0e1f207a9bd25' 
  AND token = 'gvKBSHSUe3DX78hGOfYmtQWjGLldZ+5+PRQ3KlKCQIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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