SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93a07ed24e64e1818b7658b0987cc11b23e3ed2c3bd57acb523ef5ffb0139a33' 
  AND token = 'kowJvuMSOVg4PsEVFeXBc/DLOgE11NeTmIoAnZW6whg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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