SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '13f9a3d3cf45349f672451df689efd725ed9371a0b4e294a271d350c8b01f06d' 
  AND token = '2QIaYQEISDSmg4qKD8LWHnyFGYWunsViRnj4o5xw1bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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